Abstract—This paper proposes a proportionate sign subband
adaptive filtering (PSSAF) and an improved PSSAF (IPSSAF)
algorithm for network echo cancellers that deal with impulsive
interferences and sparse echo paths. Based on a sign subband
adaptive filtering (SSAF) algorithm that is robust against
impulsive interferences, the proposed algorithm minimizes
L1-norm of the subband a posteriori error vector subject to a
weighted constraint on the filter coefficients. A positive definite
weighting matrix is used for the constraint. In this paper, we
adopt a diagonal proportionate matrix for the constraint to
achieve fast initial convergence rate when the impulse response
is sparse. The components of it is roughly proportional to the
absolute value of current estimate of the filter, so the resulting
algorithm is called PSSAF algorithm. To achieve fast initial
convergence rate even for rather non-sparse impulse responses,
an improved proportionate matrix is also used for the constraint,
and the resulting algorithm is named as IPSSAF algorithm.
Experimental results show that the proposed algorithms are
more robust against highly correlated input signals, impulsive
interferences, and double-talk than the original normalized
subband adaptive filtering algorithm and the class of
proportionate subband adaptive filtering algorithms.
Index Terms—Adaptive filters, proportionate, sign algorithm,
subband adaptive filtering algorithm, weighted constraint,
weighting matrix.
Ji-Hye Seo is with the Division of IT Convergence Engineering, Pohang
University of Science and Technology, Pohang, Gyeongbuk, Korea (e-mail:
bmclubhs@postech.ac.kr).
Sang Mok Jung and Poo Gyeon Park are with the Department of
Electrical Engineering, Pohang University of Science and Technology,
Pohang, Gyeongbuk, Korea (e-mail: illus2@postech.ac.kr,
ppg@postech.ac.kr).
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Cite:Ji-Hye Seo, Sang Mok Jung, and Poo Gyeon Park, "Proportionate Sign Subband Adpative Filtering Algorithm for Network Echo Cancellers," Journal of Advances in Computer Networks vol. 3, no. 2, pp. 99-105, 2015.
